Probe fixing structure for ultrasonic stress detection

Abstract

The application discloses a probe fixing structure capable of being used for ultrasonic stress detection, which comprises an ultrasonic probe base structure and a vacuum chuck fixing structure, wherein the ultrasonic probe base structure comprises a base body, the top of the base body is provided with a plane in the middle and a slope on the outer side, the plane is provided with a height adjusting screw hole and coupling agent chambers on both sides of the height adjusting screw hole, the slope is respectively provided with a probe screw hole for fixing an ultrasonic probe on both sides, and the coupling agent chambers and the probe screw holes are respectively communicated through a coupling agent channel. The application can avoid the volatilization of the coupling agent, can fix the probe for a long time, can reduce the inconvenience caused by disassembly and assembly, can reduce the propagation of ultrasonic signals in the base body, can reduce the error of collected signals, can improve the test precision, can be used for the fixing of the probe for the ultrasonic stress detection of ferromagnetic and non-ferromagnetic materials, and is wide in applicability and good in portability.

Description

TECHNICAL FIELD

[0001] The present application relates to a long-time used probe fixing structure for ultrasonic stress detection, belonging to the technical field of ultrasonic measurement. BACKGROUND

[0002] Ultrasonic wave can sensitively reflect the internal information of the measured material, and various information of the measured material can be non-destructively measured by using ultrasonic wave. Stress is an important basic parameter in the process of material preparation, processing deformation and use. The stress measurement method based on ultrasonic acoustic elasticity theory is developed by using the relationship between the propagation speed of ultrasonic wave in the material and the stress state. The research results show that the ultrasonic wave whose particle displacement direction is parallel to the stress direction is most sensitive to the existence of the stress. When the ultrasonic wave is emitted from the medium with small propagation speed to the medium with large propagation speed, the refraction angle will be larger than the incident angle. When the incident angle is a certain numerical value, the refraction angle is equal to 90°, the critical refraction longitudinal wave is generated, and the incident angle becomes the first critical angle. The ultrasonic stress detection technology based on the principle of detecting the critical refraction longitudinal wave needs to accurately emit and receive the wave form, and the stress detection is the change amount of the ultrasonic speed in the material, which requires very high precision. Therefore, the probe needs to be well fixed, and the probe needs to be less disassembled and moved to avoid affecting the measurement precision.

[0003] The emission and reception of critical refraction longitudinal waves require good fixation between the ultrasonic emission probe and the reception probe, and good fixation between the two probes and the measured material. In order to compare the speed change of ultrasonic waves in the material, the relative position change between the probe and the probe, and the probe and the measured material should be prevented as much as possible, the movement should be reduced, and the probe should be fixed as much as possible for long-term use. However, when the existing ultrasonic stress detection probe is used, on the one hand, the ultrasonic waves attenuate severely in the air, and the probe and the material need to be coated with a coupling agent. The coupling agent is volatile, and the probe needs to be frequently disassembled and moved, which is inconvenient and also affects the measurement accuracy. On the other hand, the ultrasonic stress test needs to detect the time difference between the ultrasonic self-emission and the reception, and the precision error is often between 1 nanosecond corresponding to several MPa to tens of MPa. The tightening force of the thread and the thickness of the coupling agent layer during disassembly of the probe can bring an error close to nanoseconds, that is, an error of several MPa may be caused. Therefore, the probe should be disassembled as little as possible during calibration and actual detection, so as to improve the detection accuracy. Moreover, the ultrasonic stress test has a very high requirement for signal accuracy. After the ultrasonic wave emission pulse waveform is emitted, the received signal is often affected, causing a nanosecond-level error in the signal. The signal needs to be denoised as much as possible. On the other hand, the probe needs to emit and receive critical refraction longitudinal waves, and needs to be fixed in position and distance with the measured material. A magnet is placed in the base to be adsorbed on ferromagnetic test materials such as steel. However, for aluminum, copper, magnesium metal materials and non-metallic materials which do not have ferromagnetic properties, the probe is still manually fixed by the operator, which is inconvenient and seriously affects the measurement accuracy. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a probe fixing structure for ultrasonic stress detection for long-term use.

[0005] In order to solve the above technical problems, the present application is realized by the following technical scheme:

[0006] A probe fixing structure for ultrasonic stress detection, comprising an ultrasonic probe base structure and a vacuum chuck fixing structure, the ultrasonic probe base structure comprising a base body, the top of the base body being a flat surface in the middle and a slope on the outside, a height adjustment threaded hole and coupling agent chambers on both sides of the flat surface being provided, a probe threaded hole for fixing an ultrasonic probe being provided on both sides of the slope, and the coupling agent chambers and the probe threaded holes being respectively connected through a coupling agent channel; the vacuum chuck fixing structure comprising a vacuum chuck and a vacuum pressing rod for controlling the vacuum chuck, a fixing beam being provided on the vacuum chuck, a threaded hole for fixing a height adjustment rod being provided on the fixing beam, and the bottom end of the height adjustment rod being connected with the height adjustment threaded hole.

[0007] Preferably, the included angle between the slope and the bottom flat surface is 20-30°; and the probe threaded hole is perpendicular to the slope.

[0008] Preferably, when the material to be measured is placed at the bottom of the base body, and the probe threaded hole is provided with an ultrasonic probe, the wave form emitted by one of the ultrasonic probes propagates to the bottom surface of the base body, and a critical refraction longitudinal wave is generated at the surface of the material to be measured, and the wave form propagates along the surface of the material to be measured and is received by the other ultrasonic probe, and the material to be measured is an organic material (such as organic glass, polymer macromolecular material or polyether ether ketone).

[0009] Preferably, when the material to be measured is placed at the bottom of the base body, and the probe threaded hole is provided with an ultrasonic probe, the wave form emitted by one of the ultrasonic probes propagates to the bottom surface of the base body, and a critical refraction longitudinal wave is generated at the surface of the material to be measured, and the wave form propagates along the surface of the material to be measured and is received by the other ultrasonic probe, and the material to be measured is an organic material (such as organic glass, polymer macromolecular material or polyether ether ketone).

[0010] Preferably, a magnet is arranged below the base body for adsorbing the magnetic material to be measured.

[0011] Preferably, one end of the coupling agent channel is arranged at the bottom of the inner wall of the probe threaded hole, and the other end is arranged at the bottom of the inner wall of the coupling agent chamber. After the coupling agent is inserted into the probe threaded hole, the coupling agent enters the coupling agent chamber through the coupling agent channel as the ultrasonic probe is tightened in the probe threaded hole. By supplementing the coupling agent in the coupling agent chamber, the evaporation of the coupling agent at the contact surface of the ultrasonic probe is avoided.

[0012] Preferably, a sealing cover plate is arranged at the top of the coupling agent chamber to reduce the evaporation of the coupling agent inside the coupling chamber, avoid the inconvenience and error of repeatedly applying coupling agent and disassembling the probe during long-term use, improve the precision and achieve the purpose of long-term use.

[0013] Preferably, wave-absorbing damping soundproofing materials are arranged between the bottom and the inner wall of the coupling agent chamber and between the magnet and the base body to reduce the influence of the ultrasonic emission signal on the received signal after excitation.

[0014] More preferably, the wave-absorbing damping soundproofing materials are porous soundproofing cotton, damping glass paper, soundproofing film or sound-absorbing felt.

[0015] More preferably, the base body is a split structure, including two symmetrically arranged and structurally identical parts, the top surface of each part is a plane, and one side is an inclined surface; the top of the plane is provided with a height adjustment threaded hole and a coupling agent chamber, and the inclined surface is provided with a probe threaded hole.

[0016] The working principle of the present application is as follows: the ultrasonic emission probe and the receiving probe are respectively screwed into the probe threaded holes on the two sides of the base body, so as to ensure that the waveforms emitted by the ultrasonic probe are vertically incident along the symmetry axis of the threaded hole to the organic material medium, and the waveforms are emitted from the medium with a small propagation speed to the medium with a large propagation speed, and the angle between the bottom surface of the measured material and the waveforms is 70°-60°. The organic material medium is acrylic, polystyrene, polyether ether ketone and other organic materials with an ultrasonic propagation speed of about 2000-3000 m / s. The measured material is steel, aluminum, magnesium, ceramic and other materials with an ultrasonic propagation speed of about 5000-7000 / s. At this time, the first critical angle formula of ultrasonic wave is satisfied, the refraction angle is greater than 90°, the critical refraction longitudinal wave is generated, and the ultrasonic probe screwed into the threaded hole on the other side receives the wave after the wave propagates along the surface of the measured material. The ultrasonic wave attenuates severely in the air, so the ultrasonic probe needs to be coated with a coupling agent when screwed into the threaded hole. The coupling agent is volatile, and the probe needs to be frequently disassembled and moved, which is very inconvenient. In addition, the ultrasonic stress measurement is the change of the ultrasonic speed in the material, which belongs to high-precision measurement. Frequently moving and disassembling the probe will affect the measurement accuracy. In the present application, a coupling agent channel is opened at the end of the probe threaded hole, that is, the end surface of the ultrasonic probe, which is directly connected to the coupling agent chamber to supplement the coupling agent in the coupling agent chamber, so as to avoid the volatilization of the coupling agent on the surface of the ultrasonic probe in the threaded hole. At the same time, a sealing cover plate can be matched on the top of the coupling agent chamber to avoid the volatilization of the coupling agent in the coupling chamber, so as to avoid the influence of repeated disassembly of the probe on the measurement accuracy and achieve the purpose of long-term use. In addition, the position and distance between the probe and the measured material also need to be fixed. For ferromagnetic test materials such as steel, the base body can be fixed and attached to the surface of the measured material by the magnet at the bottom to improve the detection accuracy and reduce the measurement error. For non-ferromagnetic test materials, the vacuum suction disc structure and the fixed beam can be used to realize the fixation or compression connection between the base body and the measured material by connecting the height adjustment rod with the base body through threads, so as to realize good position fixation, improve the detection accuracy and reduce the error.

[0017] The common water-soluble polymer gel coupling agent for B-ultrasound is selected, the coupling agent channel is opened on the side without the coupling agent chamber, the coupling agent is directly discharged to the air when the probe is screwed in, the coupling agent at the interface is volatile, and the probe needs to be disassembled and coated with coupling agent again after about 30 minutes. The coupling agent channel and the coupling agent chamber are used together in the present application, the coupling agent in the coupling agent chamber is supplemented, and the probe can be used for one day without disassembly. The coupling agent chamber with the added sealing cover plate can be used for two weeks. The effect can be maintained for more than a few months by regularly adding coupling agent to the coupling agent chamber, so as to avoid errors in short-time detection of ultrasonic signals.

[0018] The signal collection accuracy is extremely high for ultrasonic stress testing, although the collected signal can be processed by filtering and the like, but there will still be spurious peak signals in the waveform, especially after the ultrasonic wave emission pulse excitation, on the one hand, the signal will propagate along the material, and there is also propagation in the base body, then the signal is collected by the receiving probe and thus affects the received signal, when the corresponding gate is used to detect the critical wave, there will be an error of more than nanoseconds, which has a great influence on the high-precision ultrasonic stress collection equipment, and the signal propagating along the base body needs to be denoised, therefore, wave-absorbing damping soundproofing materials are attached between the coupling agent chamber bottom, the inner wall and the magnet and the base body, for absorbing the waveforms propagating in the base body.

[0019] Further, the position and distance between the probe and the measured material also need to be fixed, for ferromagnetic test materials such as steel, the base body can be fixed and attached to the surface of the measured material by the magnet at the bottom, to improve the detection accuracy and reduce the measurement error, and for non-ferromagnetic test materials, the vacuum chuck structure and the fixing beam can be used, the height adjustment rod is connected to the base body through threads, to realize the fixation or compression connection between the base body and the measured material, to realize good position fixation, improve the detection accuracy and reduce the error.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1. The specific angles of the probe base two sides and the probe threaded hole of the present application ensure that when the ultrasonic probe is incident to the measured material from the organic material, the first critical angle formula is met, the critical refraction longitudinal wave can be generated, the relative position of the probe is fixed, and the stability of the collected signal is ensured.

[0022] 2. The special design of the coupling agent channel and the coupling agent chamber of the present application ensures that the probe and the organic material medium can be closely attached, the excess coupling agent can be discharged to the coupling agent chamber and stored, the coupling agent can be supplemented to the coupling agent chamber while the coupling agent is volatilizing, as long as the coupling agent chamber is not completely volatilized, the coupling agent between the probe and the organic material medium will not volatilize, the volatilization of the coupling agent at the interface is avoided, the probe does not need to be repeatedly disassembled and assembled, the error is caused, the measurement accuracy is improved, and the probe can work for a long time.

[0023] 3. The damping sound-absorbing materials are arranged between the coupling agent chamber bottom, the four walls and the magnet and the base body, to reduce the propagation of the ultrasonic signal in the base body, thereby avoiding affecting the ultrasonic echo signal, improving the collection accuracy and reducing the error.

[0024] 4. The magnet at the base bottom and the vacuum chuck fixing structure realize the good attachment and fixation of the base on the surface of the ferromagnetic material and the non-ferromagnetic material, the problem of poor position accuracy of the manually fixed probe and the test material is avoided, the test accuracy is improved, and the base can basically adapt to the clamping and fixation of all materials. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is a structural diagram of the present application;

[0026] Figure 2 is a cross-sectional diagram of the base body being an organic material;

[0027] Figure 3 is a cross-sectional diagram of the base body being a non-ferromagnetic metal material;

[0028] Figure 4 is a cross-sectional diagram of the base body being a split type and an organic material;

[0029] Figure 5 is a cross-sectional diagram of the base body being a split type and a non-ferromagnetic metal material. DETAILED DESCRIPTION

[0030] In order to make the present application more apparent and easy to understand, the preferred embodiments are described in detail below with reference to the accompanying drawings.

[0031] EMBODIMENT

[0032] As Figures 1-5As shown, the application provides a long-time used probe fixing structure for ultrasonic stress detection, which comprises an ultrasonic probe base structure and a vacuum chuck fixing structure, the ultrasonic base structure comprises a base body 5, a height adjusting threaded hole 6, a probe threaded hole 7, a coupling agent chamber 8, a coupling agent channel 9, and a magnet 10; the vacuum chuck fixing structure comprises a vacuum chuck 1, a vacuum pressing rod 2, a fixing beam 3, and a height adjusting rod 4; the included angle between the inclined surface on the side of the base body 5 and the bottom plane is 20-30°, the probe threaded hole 7 is vertically processed on the inclined surface with a certain depth, the central symmetry axis of the probe threaded hole 7 and the horizontal bottom plane form an included angle of 70°-60°, which ensures that the waveform emitted by the ultrasonic probe after being screwed inside can be vertically incident on the organic glass and propagate to the surface of the bottom measured material 11 at an angle of 70°-60° to generate a critical refraction longitudinal wave, which is received by the ultrasonic probe screwed in the other side probe threaded hole 7 after propagating along the surface of the measured material 11; the base body 5 is provided with the coupling agent chamber 8, and the coupling agent chamber 8 is connected with the probe threaded hole 7 through the coupling agent channel 9; the base body 5 is provided with the magnet 10 below; the wave-absorbing damping sound insulation material is pasted between the bottom and inner wall of the coupling agent chamber 8 and between the magnet 10 and the base body 5; the upper part of the vacuum chuck 1 is provided with a twistable vacuum pressing rod 2, the twistable vacuum pressing rod 2 can discharge the air between the vacuum chuck and the adsorbed material to realize the fixing function of the vacuum chuck 1; the upper part of the vacuum chuck 1 is fixed with the fixing beam 3, the fixing beam 3 is provided with a threaded hole, which is connected with the height adjusting rod 4 through threads, the top of the base body 5 is provided with the height adjusting threaded hole 6, which realizes the fixed or compressed connection between the height adjusting rod 4 and the base body 5;

[0033] Further, the ultrasonic wave emitting probe and the receiving probe are screwed into the probe threaded holes on the two sides of the base body, which ensures that the waveform emitted by the ultrasonic probe is vertically incident on the organic material medium along the symmetry axis of the threaded hole, forms an angle of 70°-60° with the surface of the bottom measured material, and the organic material medium is acrylic, polystyrene, polyether ether ketone and other organic materials with an ultrasonic wave propagation speed of about 2000-3000 m / s; the measured material is steel, aluminum, magnesium, ceramic and other materials with an ultrasonic wave propagation speed of about 5000-7000 / s, which satisfies the first critical angle formula of ultrasonic wave, so that the refraction angle is greater than 90°, a critical refraction longitudinal wave is generated, and the ultrasonic probe screwed in the other side probe threaded hole 7 receives the wave after propagating along the surface of the measured material 11;

[0034] Further, the ultrasonic detection must be coupled to work, the probe screw hole 7 is built in the coupling agent, and then the probe is screwed in. If there is no coupling agent channel, there will be a thick coupling agent between the ultrasonic probe and the organic material medium, which cannot be attached to affect the measurement. If the coupling agent channel is opened on both sides, although the coupling agent can be discharged, the cross section between the probe and the organic material medium is exposed to air, the coupling agent is easy to evaporate, and the probe needs to be repeatedly disassembled and assembled, which is not only inconvenient but also causes errors and affects accuracy. Therefore, one end of the coupling agent channel 9 is opened in the inner wall of the probe screw hole 7, and the other end is opened in the inner wall of the coupling agent chamber 8. As the ultrasonic probe is tightened in the probe screw hole 7, the coupling agent enters the coupling agent chamber 8 through the coupling agent channel 9, and the coupling agent can be supplemented to the coupling agent chamber 8 to avoid the evaporation of the coupling agent on the surface of the ultrasonic probe. The sealing cover plate on the top of the coupling agent chamber 8 reduces the evaporation of the coupling agent in the coupling chamber 8, avoids the inconvenience and error of repeatedly disassembling and assembling the probe, improves the accuracy, and achieves the purpose of long-term use.

[0035] At the same time, the ultrasonic stress test needs to detect the acoustic time difference between the ultrasonic self-emission and reception. The precision error is often between 1 nanosecond corresponding to several MPa to tens of MPa. The tightening force of the thread and the thickness of the coupling agent layer during disassembly and assembly of the probe can cause nanosecond-level errors, that is, several MPa of errors. Therefore, during calibration and actual detection, the probe should be disassembled and assembled as little as possible to improve the detection accuracy. However, the existing probe block does not have this capability, and the coupling agent evaporates too quickly, requiring continuous disassembly and assembly of the probe to supplement the coupling agent, causing detection errors. The design of the coupling agent channel and the coupling agent chamber of the probe of the present application solves this problem. By continuously supplementing the coupling agent in the coupling agent chamber, the probe can be used for a long time without disassembly and assembly.

[0036] A common water-soluble polymer gel coupling agent for B-ultrasound is selected, the coupling agent channel is opened on the side without the coupling agent chamber, the coupling agent is directly discharged to the air when the probe is screwed in, the coupling agent at the interface is easy to evaporate, and the probe needs to be disassembled and assembled again to apply the coupling agent after about 30 minutes. The coupling agent channel and the coupling agent chamber are used together in the present application, the coupling agent in the coupling agent chamber can be supplemented without disassembly and assembly of the probe, which can be used for one day, and the coupling agent chamber design with the addition of a sealing cover plate can be used for two weeks. The effect can last for more than a few months by regularly adding coupling agent to the coupling agent chamber, avoiding errors in short-time ultrasonic signal detection.

[0037] Further, the probe and the measured material also need to be fixed in good position and distance. For ferromagnetic test materials such as steel, the bottom magnet can be used to fix and adhere the base body to the surface of the measured material, thereby improving the detection accuracy and reducing the measurement error. For non-ferromagnetic test materials, the vacuum chuck structure and the fixed beam can be used to connect the base body to the measured material through the height adjustment rod, thereby realizing the fixed or compression connection of the base body to the measured material, achieving good position fixing, improving the detection accuracy, and reducing the error.

[0038] Further, in the probe fixing structure for ultrasonic stress detection, the bottom surface of the base body 5 has a groove, and a magnet 10 is attached in the groove. When detecting ferromagnetic materials, the base body can be adsorbed to the surface of the material.

[0039] Further, the ultrasonic signal propagates in the material from the transmitting probe and also propagates in the base body, and then is collected by the receiving probe, thereby affecting the received signal. When the corresponding gate is used to detect the critical wave, an error of more than nanoseconds will occur. Therefore, wave-absorbing damping soundproof glass paper is attached between the bottom of the coupling agent chamber 8, the inner wall, and the magnet 10 and the base body 5, which is used to absorb the waveforms propagating in the base body. Alternatively, other wave-absorbing damping soundproof materials such as soundproof film, soundproof plastic, and film can be used.

[0040] Further, in the probe fixing structure for ultrasonic stress detection, in one case, the base body 5 is made of non-magnetic organic materials such as organic glass, polymer macromolecular materials, and polyether ether ketone. When the ultrasonic probe is screwed in the probe threaded hole 7, the waveform emitted by the ultrasonic probe propagates at an angle of 70°-60° to the bottom surface to produce a critical refraction longitudinal wave at the surface of the measured material 11. The ultrasonic probe screwed in the other side of the probe threaded hole 7 receives the wave.

[0041] In another case, in the probe fixing structure for ultrasonic stress detection, the base body 5 is made of non-magnetic copper and aluminum. The hole at the position of the probe threaded hole 7 is punched through to the bottom surface, and the missing part is filled with an organic material filling block 12 (see Figure 3 ), so that the waveform emitted by the ultrasonic probe can first enter the organic glass and then produce a critical refraction longitudinal wave at the surface of the measured material 11 on the bottom surface, and be received by the ultrasonic probe on the other side.

[0042] Further, in the above-mentioned ultrasonic stress detection probe fixing structure, the base body 5 is designed in one piece, and can also be designed in two pieces. The two-piece design is based on the one-piece structure, and each part has a flat top surface and an inclined surface. The flat top surface is provided with a height adjustment threaded hole 6 and a coupling agent chamber 8, and the inclined surface is provided with a probe threaded hole 7. The central symmetry axis and the horizontal bottom surface still form an angle of 70°-60°. A one-sided coupling agent channel 9 is connected between the one-sided coupling agent chamber 8 and the probe threaded hole 7. A magnet 10 is arranged at the bottom. The height adjustment threaded hole 6 is used to fix the vacuum chuck structure, as shown in Figure 4 , 5.

Claims

1. A probe fixing structure for ultrasonic stress detection, characterized in that, The system includes an ultrasonic probe base structure and a vacuum suction cup fixing structure. The ultrasonic probe base structure includes a base body (5), the top of which has a flat surface in the middle and an inclined surface on the outside. The flat surface has a height adjustment threaded hole (6) and coupling agent chambers (8) on both sides. The inclined surface has a probe threaded hole (7) for fixing the ultrasonic probe on each side. The coupling agent chambers (8) and the probe threaded holes (7) on both sides are connected by a coupling agent channel (9). The vacuum suction cup fixing structure includes a vacuum suction cup (1) and a vacuum pressure rod (2) for controlling the vacuum suction cup (1). A fixed beam (3) is provided on the probe, and a threaded hole for fixing the height adjustment rod (4) is provided on the fixed beam (3). The bottom end of the height adjustment rod (4) is connected to the height adjustment threaded hole (6). One end of the coupling agent channel (9) is located at the bottom of the inner wall of the probe threaded hole (7), and the other end is located at the bottom of the inner wall of the coupling agent chamber (8). After the coupling agent is put into the probe threaded hole (7), as the ultrasonic probe is tightened in the probe threaded hole (7), the coupling agent enters the coupling agent chamber (8) through the coupling agent channel (9). By replenishing the coupling agent in the coupling agent chamber (8), the evaporation of the coupling agent at the contact point on the surface of the ultrasonic probe is avoided.

2. The probe fixing structure for ultrasonic stress detection as described in claim 1, characterized in that, The angle between the inclined plane and the bottom plane is 20-30°; the probe threaded hole (7) is perpendicular to the inclined plane.

3. The probe fixing structure for ultrasonic stress detection as described in claim 1 or 2, characterized in that, When the base body (5) is made of organic material, the material to be tested (11) is placed at the bottom of the base body (5). Each of the probe thread holes (7) is equipped with an ultrasonic probe. The waveform emitted by one of the ultrasonic probes propagates to the bottom surface of the base body (5) and generates a critical refracted longitudinal wave at the surface of the material to be tested (11). The waveform propagates along the surface of the material to be tested (11) and is received by the other ultrasonic probe.

4. The probe fixing structure for long-term use in ultrasonic stress detection as described in claim 1 or 2, characterized in that, When the base body (5) is made of non-ferromagnetic metal, the probe threaded hole (7) is a through hole that communicates with the bottom surface of the base body (5), and the bottom of the through hole is filled with organic material.

5. The probe fixing structure for ultrasonic stress detection as described in claim 1, characterized in that, A magnet (10) for adsorbing magnetic test materials is provided below the base body (5).

6. The probe fixing structure for ultrasonic stress detection as described in claim 1, characterized in that, The coupling agent chamber (8) is provided with a sealing cover at the top.

7. The probe fixing structure for ultrasonic stress detection as described in claim 1, characterized in that, The bottom and inner wall of the coupling agent chamber (8) and the space between the magnet (10) and the base body (5) are provided with wave-absorbing, damping, and sound-insulating materials.

8. The probe fixing structure for ultrasonic stress detection as described in claim 7, characterized in that, The aforementioned sound-absorbing and damping material is porous sound-absorbing cotton, damping glass paper, sound-absorbing film, or sound-absorbing felt.

9. The probe fixing structure for ultrasonic stress detection as described in claim 1, characterized in that, The base body (5) is a split structure, including two symmetrically arranged and identical parts. The top surface of each part is a plane and one side is an inclined plane. The top of the plane is provided with a height adjustment threaded hole (6) and a coupling agent chamber (8), and the inclined plane is provided with a probe threaded hole (7).

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